R.B. Parsons , The economics of microforms as a storage medium in libraries, N LL review, 2 (1972), p. 45-55; 124-125.
2.
S.S. Salmon , User resistance to microforms in the research library, Microform review, 3 (1974), p. 194-199.
3.
K.W. Neubauer — S. Selbmann, Application of International Standard Book Numbers (ISBN) in libraries, Unesco bulletin for libraries , 28 ( 1974), p. 125-140; F.H. Ayres, The Universal Standard Book Number (USBN): a new method for the construction of control numbers for bibliographic records, Program, 8 ( 1974), p. 166-173.